Coffee: The Art of the Dial-In
Like Duolingo, but for Coffee: The Art of the Dial-In. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through Mastering the Extraction Loop and The Variables Behind the Flavor. It assumes you already know the basics.
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Key ideas in Coffee: The Art of the Dial-In
- Under-extraction tastes sharp and salty
- Sourness indicates you need to extract more from the grounds
- Balanced extraction maximizes sweetness
- Finer grinds increase surface area for faster extraction
- Over-extraction results in a dry, ashy bitterness
- Finer particles slow down water flow to increase contact time
- Recognizing the sensory progression of extraction from under to over
- Using grind size to solve a specific extraction problem
- Acids dissolve first in the brewing process
- The Salami Shot involves switching cups during a single brew
- Sugars require more time to fully extract
- Heavy tannins and plant fibers extract last
- Mapping the sequence of compound extraction to the resulting flavor
- This technique reveals the transition from sour to bitter
- It helps identify the exact second flavor peaks
- Identifying the diagnostic tool for tasting extraction stages
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Coffee: The Art of the Dial-In the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
You take a sip and it's unpleasantly sour. What is your coffee telling you?
Get it right to open this lesson and 10 more in the app.
Where Coffee: The Art of the Dial-In takes you
Move beyond the recipe and learn to manipulate extraction, water chemistry, and bean processing to craft your perfect cup every morning.
- 1
Mastering the Extraction Loop
- The Dial-In: Balancing Sour and Bitter
- Texture and Body: The Mouthfeel Variable
- 2
The Variables Behind the Flavor
- Decoding the Bean: Process and Varietal
- Water: The Invisible Solvent
2 sections · 4 units · 11 levels. Built to play, not to enroll.
You pick the voice
Coffee: The Art of the Dial-In is taught in the The Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Coffee: The Art of the Dial-In today.
Download Tomo, search Coffee: The Art of the Dial-In, and play your first lesson in under a minute.